I recognized the tone of President Obama’s voice at the beginning of the press conference last night. Katie Couric called it “stern.” That’s a polite way to put it.
It was the tone of voice I use when I mean to imply that the rest of y’all are a bunch of [expletive] idiots. Let me explain it again in clear, simple terms that a fool could understand.
He calmed down a bit and began bantering after the lecture.